Structure of high spin states in83Y View Full Text


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Article Info

DATE

1988-12

AUTHORS

C. J. Lister, B. J. Varley, W. Fieber, J. Heese, K. P. Lieb, E. K. Warburton, J. W. Olness

ABSTRACT

We report on the first in-beam study of high spin levels in83Y which were established up to 9.0 MeV excitation energy and probable spin of 41/2+ resp. 27/2− by means of the reaction58Ni(28Si, 3p). Ten lifetimes and six lifetime limits in the 10−12–10−9 s range were determined in two recoil distance Doppler shift experiments. The positive parity yrast states form ag9/2 Coriolis decoupled band with partial alignment, near-rigid rotor moment of inertia and deformationβ2=0.29. The negative parity yrast band has very similar collective properties; it shows a pronounced band crossing at rotational frequency ħω≈0.40 MeV which we associate with twoquasiparticleg9/2 proton alignment. At 2.56 MeV excitation, a second ΔI=1 band starting with 17/2− was found. On the basis of the similarity to85Y and the very weakE2 decay of this state, we suggest that this band has (3qp) configuration with an alignedg9/2 neutron pair. The lifetimes of the lowest 2+ and 4+ state in84Zr populated in the reaction58Ni (28Si, 2p) were determined to be τ(2)=17.8(11) ps resp. τ(4)=3.5(4) ps. More... »

PAGES

413-427

References to SciGraph publications

  • 1982-12. Qβ Measurements and mass excess values for neutron deficient isotopes nearN∼Z∼40 in ZEITSCHRIFT FÜR PHYSIK A HADRONS AND NUCLEI
  • 1985-12. Decay of three-particle high spin states in85Y in ZEITSCHRIFT FÜR PHYSIK A HADRONS AND NUCLEI
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    http://scigraph.springernature.com/pub.10.1007/bf01294346

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    http://dx.doi.org/10.1007/bf01294346

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